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|
{-# LANGUAGE CPP, GADTs #-}
-- |
-- The Remote GHCi server.
--
-- For details on Remote GHCi, see Note [Remote GHCi] in
-- compiler/GHC/Runtime/Interpreter.hs.
--
module Main (main) where
import IServ (serv)
import GHCi.Message
import GHCi.Signals
import GHCi.Utils
import Control.Exception
import Control.Concurrent (threadDelay)
import Control.Monad
import Data.IORef
import System.Environment
import System.Exit
import Text.Printf
dieWithUsage :: IO a
dieWithUsage = do
prog <- getProgName
die $ prog ++ ": " ++ msg
where
#if defined(WINDOWS)
msg = "usage: iserv <write-handle> <read-handle> [-v]"
#else
msg = "usage: iserv <write-fd> <read-fd> [-v]"
#endif
main :: IO ()
main = do
args <- getArgs
(wfd1, rfd2, rest) <-
case args of
arg0:arg1:rest -> do
let wfd1 = read arg0
rfd2 = read arg1
return (wfd1, rfd2, rest)
_ -> dieWithUsage
(verbose, rest') <- case rest of
"-v":rest' -> return (True, rest')
_ -> return (False, rest)
(wait, rest'') <- case rest' of
"-wait":rest'' -> return (True, rest'')
_ -> return (False, rest')
unless (null rest'') $
dieWithUsage
when verbose $
printf "GHC iserv starting (in: %d; out: %d)\n"
(fromIntegral rfd2 :: Int) (fromIntegral wfd1 :: Int)
inh <- getGhcHandle rfd2
outh <- getGhcHandle wfd1
installSignalHandlers
lo_ref <- newIORef Nothing
let pipe = Pipe{pipeRead = inh, pipeWrite = outh, pipeLeftovers = lo_ref}
when wait $ do
when verbose $
putStrLn "Waiting 3s"
threadDelay 3000000
uninterruptibleMask $ serv verbose hook pipe
where hook = return -- empty hook
-- we cannot allow any async exceptions while communicating, because
-- we will lose sync in the protocol, hence uninterruptibleMask.
|
